The Sian Kaan Biosphere Reserve, which begins just outside our gate is a protected natural area with miles of empty beaches, unspoiled rainforest and vast lagoons. The second largest protected area in Mexico, Sian Kaan (which means where the sky is born in Mayan) is home to hundreds of species, birds, peccaries, tapirs, alligators, manatees, iguanas, fish and sea turtles.. Approximately 345 species of birds including more than a million migratory ones live here.